Electrical welding or sheet metal.



l E. THOMSON, ELECTRICAL WELDING 0F SHEET IE'I'AL.l APPLIoATloN FILED dor. Q1. ma.

978,586.' I i l Patented one. 25,1910.

' nunm l lf I . Toall whom it may concern:

'trica-l Weldingof Sheet srafpnqs PATENT vonirica ngtmtr THOMSON, or swAmoTT, MASSACHUSETTS, .essIGNoa BY unsNn assiom- MENTS, TO THOMSON'l E EUPB'IC WELDING COMPANY, 0F LYNN, MASSACHUBETTB.

.e conronATxoN or xAssAoEUsnTTs.

ELncTnIoAL WELDING oF SHEET METAL.

Be .it known that I, ELIHU THOMSON, a citizen of the United States, and aresident of Swam scott, in the county of Esse'x and State of assachusetts, have invented certain new and useful Im rovements in Elecetal, of which the following is a specification.

` My invention'relates to that class of metal work in which plates or sheets of metal are u nited on their opposed faces by one or more isolated spots ofvwelded union as described in the patent toA. F. Rietzel, No. 928,701.v

My invention refers niore-partieularl to that special form of the invention in w lich a piece of metal is interposed between the' sheets or platesat each spot of desired 'union to produce the desired localized electrical heating and pressure.

' My present invention consists substantially in the use of tongues or teeth formed `from the body of the sheet metal piece forA pieces tobe united'a'ndturned back upon the plane of the sheet-so that when the sheets 012* p ates are su erposed each of said tongues of teeth will, y its mterposition, serve asy i it were a separate piece,interposed inthe iannerdes'cri ed inthe aforesaid patent.

v In' carrying out my invention, the Saidf lappin tongues or teeth may be formed in the edge,"

one'or' both of the fpl-ates'or sheets-When" they are to be united or toot outside boundarieso'f'the ysheet by: 'artially 'outtin a holetheiein and folding' ack the parta ly eut-outv ieee or tongue uponthel .planeof the meta sheet. f

-In 'the accompanying drawing@ Figure jshows one of two sheets of metal to bunited pgior tothe formation of the 1'tongues'. 'orjI ehh-therein. Fig-.2 shows the same at the first s't'ageof its preparation by cutting out the-'edge to form promoting teeth or ton esl 'and' Flg. '3 shows said teet ortongues old. upon the of the sheet.' Fig. 4 shows sai prepared eet andanother s eet.`

.l ylappednpon it for electrical Welding of thetwo sheets or plates together at s ts of isolated welded union coincident wit the -weldcation, in' the lform of said teeth or. tonguesace to face by a more at; their-,edges or each said tongue-f. maybe formed Wholly` within tiea'" heatin stood in theart.

metal at one or more isola r Patented out'. 25, 1910.

`prepara-tory to being folded back upon the ody of the sheet to form separate pieces as shown in Fig. 6. Fig. 7 shows a sheet as 55 prepared with folded back tongues located entirely Within thel boundaries of the sheet land adapting the same for being welded to another sheet orplate of the same or diierf ent size superposed' upon 1t. 5g

Referrin to Fig. 1,1 show a' rectangular sheet-.or p ate whose edge maybe cut out.v by a stamp to form tongues. or pro'ecf tions 2, shown in Fig. 2.1QA`fter the oie-.:

mation of these ton es the same are laid (Jr-" folded back upon t e body of the-sheet as shown in Fig. 3. When another sheet is' overlapped upon the sheet Fig. 3 and as shown 1n Fig. 4, the said `tongues 2 Will I .form the separating projeetions'whereby the "7o points ofweldin' are localized upon the ap? plication oi an e ectriccurrent and pressure after the manner described in the aforemew tioned atent. 4

In Figs. 2 and 3 the 'formed entirely Within the side edges of the plate, but some of them might be formed. at

fthe edges as shown in Fig. 5 and'they' might be square-ended, as illustrated in said figure teeth'- are shown as 7S i and in Fig. 6, or as will be obvious, might so be ofany other desired form.

lnFig. 7 I how the tonguesor'teeth as formed entirely within `the boundaries 'of the int the.- metal tongues so orme b'ent back along plate 1. In'this case cuts may-be. formed the line 4 upon the surface ofthe. Sheet.

Another sheet'beinguperposed'upon thesheet 1, the bent back ton' es serve-in a manner already- Lto.

Sheets are @trades 0f.

and ressursiw preise toget er btlfee an electric welding' What I claim-as my -imrantion-is;` 1. Themethod vo f weld'1`11g tivo"sheets of metal together `consisting in 4fo'nnii'aig' a ton e or tonguesin the body of'a sheet, b en 'ng the tongue back upon' the surface to`l be united,fsuperposing thesheet and -apply- 10o an. electrlc v "as and for the purpose described.- l ing teethor tongues: Fig. shows a modifheating' current and pressure,-

'two of e plate exceptin valon ythe vline 4;, and 85 loealize 'th -90 consisting in providin a sheet with a and State of Messaehsette thisL 19th dey of tgngue oir ong-ues cut om th. bottil of fa October A. D. 1909. s eet en ent over on e sur ece ereo placing another sheet. over the same and ap- ELIHU THOMSON' 5 plyin li ating electric current and pressure, Witnesses:

as enl fr die purpose described. JoHN A. MCMANUS, Jr.,

Signed at; Lynn in t e `countyl of Essex ROBERT SHAYND. 

